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Phase Transition
A phase transition is the point at which enough energy is introduced or taken away from a system for the contents to change state. The concept of a phase transition has been co-opted by other disciplines beyond its original definition from chemistry. It refers to the point at which things reach a critical change, the narrative of the before and after. In much the same way as in chemistry, this change could be caused by pressure, temperature or free energy. It is such a complete metamorphosis that the outcome is hardly recognizable from the previous incarnation.